Is there any possibility to adding a value beside expression in driven property?
A shortcut to entering driver expressions is to start with a # - so entering #frame*0.1 will create a driver expression that sets the value to 1/10th of the current frame. You can then edit drivers using the graph editor in driver mode.

Using the # prefix works for some things that are available globally, like the current frame and some math functions - sin(), log(), noise.random() etc. To get a driver to depend on a transform channel or property, whether it is it's own property or another objects, you create driver variables and use them in your expression.



To see a full list of functions available within drivers, enter bpy.app.driver_namespace.keys() into blenders python console.

You can also define your own functions and add them to the driver namespace as shown here.